KNX RGBW control acting crazy

Third party integrations
1

Hello,
my KNX RGBW control is acting recently very strange. It used to work all find and I would not be aware of any change that I had done that could have any impact on the controlls.

Basically when I turn on the RGBW lights I can not control the color. not that it does not act at all but is mostly stays on white, sometimes changes to other colors, mostly sticks to white or other light colors.
Secondly it is not only controlling the light that is adressed by the entity but also another RGB light!.
I checked the KNX entity settings and they are completely correct.
When I see the KNX monitor log I see what I observe when I try to change the lights: there are KNX telegrams going out mainly on white, sometimes on the other colors, and also to the second RGBW.

I’m really lost!

Any ideas where to look?
Thanks!

2

Attached a screenshot of the KNX group monitor. This was taken while I was changing colors. As you can see it has mainly sent out telegrams to white, no matter what color I selected. The result on the RGB strip was a shift between white at several brightness levels and red.
Obviously HA does not correctly generate the KNX telegrams.
Just to test, I created a light just on a single RGB color and then it works.

How can this be?

IMG_2585
IMG_25852752×2064 516 KB

3

Hi :wave:!
This is probably a configuration issue.
Please provide more information, like how exactly it is configured and since when it started to not work anymore.

4

Hello Farmio,

what additional information would be helpfull?

This is how the card has been setup:

  - type: custom:mushroom-light-card
    entity: light.ambiente_esszimmer
    name: Ambiente Esszimmer
    icon: mdi:lightbulb-group-outline
    primary_info: name
    secondary_info: state
    use_light_color: true
    show_brightness_control: true
    show_color_temp_control: true
    show_color_control: true
    collapsible_controls: true
    tap_action:
      action: toggle
    double_tap_action:
      action: more-info
    card_mod:
      style: |
        ha-card {
          border: none;
          box-shadow: none;
        }

I’m also attaching the KNX setup screenshots.

Screenshot 2025-09-03 at 09.24.55
Screenshot 2025-09-03 at 09.24.55681×748 42.3 KB

Screenshot 2025-09-03 at 09.24.42
Screenshot 2025-09-03 at 09.24.42707×491 26.4 KB

5

“Brightness” is overall brightness, not brightness of a single color.

Other than that, I have no idea.

6

I had this already changed during my attempts to find a solution but it did not have an impact.
I would not have expected it any differently because from what I see HA is just not generating the right KNX telegrams. Like when I change the color to red there should be a KNX telegram going out that sets red to 255 but this is just not happening. Hence this appears to be rather an issue of HA than the link to KNX.

7

One think I have noticed though:
For the brightness control I’m using the group dimming objects of the RGBW controller. These however do not appear in HA. I can manually enter the adresses but they are not resolved as usual into their names.

Could that be a hint?

8

this just means that the uploaded project file is out of date / not in sync with your actual project… so maybe update this to see if the assigned GAs are still correct.

Also, fix the configuration (remove “brightness”, add the addresses to “white” instead if it is only white brightness) and have a look at the group monitor again then.

I don’t know what this means. Maybe make a screenshot of the controllers object list so we can see what object has which GAs assigned and which DPT is used.

in a correct individual addresses configuration, it should send 3-4 telegrams. One for each color.

9

Screenshot 2025-09-04 at 19.40.11
Screenshot 2025-09-04 at 19.40.111365×376 64.9 KB

Have a look at the log report attached.
Starting Point is the RGB being off.
I clicked on a pure green to get the RGB started.
What goes out to KNX is however: Set red to 20%, White 0%.
This is then what the controller executes and confirms.

Next I changed it to a bright blue:

Screenshot 2025-09-04 at 19.43.56
Screenshot 2025-09-04 at 19.43.561367×311 55.6 KB

again what you see is that is sets white and red values to 0%. Which is probably right. What is missing is HA triggering green.

My KNX files by the way is up to date, freshly uploaded.

Can

10

I’m starting to wonder if this is even the correct entity. Do you have yaml entities too? Have you checked the entity_id of the one you are trying to configure? Have you tried to delete the entity in UI and add it as new one?

11

yes, I did all of that. I removed it from the KNX integration and added it again manually.
in HA it is just a single entity, there is not much magic. I’m testing with selecting the entity from the KNX integration page, hence there is no YAML or any specific cards settings involved.

12

Found the issue. Thanks for reporting :+1:
Should be fixed - hopefully in 2025.9.2 - by

13

WOW! I‘m really curious to try this out!
In the meanwhile I have already started a completely new clean installation and did some discoveries: When you swipe over the color wheel HA will send out the commands to KNX but since there is a delay in getting the reponses back it might lead to some kind of issues as I described.
It works better when you simply click on the target color and give it a while….
However this improved but did not fix the issue.
So really curious to try this fix.
I will report!
Thanks a lot for all the toughts you have put into my case!